Answers

Go to the bottom of celadon town go right theres a few places check there and when your in the right place theres 4 people go to the top of the place go left theres a man talk to him he will give you one with 50 coins in and go have fun

The Celadon city kitchen i think the second to last building at the very bottom of city, go the the table in the to left hand corner and talk to the man there, he will say he lost everything and gives you his case.

If you go to Celadon City, enter the diner located in the north-eastern area. Inside are about 4 or 5 people. You have to talk to the one in the back of the diner. He will tell you he lost all his money gambling and that he won't be needing his Coin Case anymore, so he gives it to you. If you enter the Gambling corner search around with or without and Itemfinder. You can find around 200 coins doing this, and 50 coins by talking to numerous people in the Gambling Corner.